.container {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 200px;
  background: #f0f0f0;
  padding: 20px;
  box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.sidebar button {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  background: #4CAF50;
  color: white;
  border: none;
  cursor: pointer;
}

.content {
  flex: 1;
  padding: 20px;
}

.hidden {
  display: none;
}

#file-preview {
  margin: 15px 0;
  border: 1px solid #ddd;
  padding: 10px;
  max-height: 300px;
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

th, td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
}

.success-toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #4CAF50;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  animation: slideIn 0.3s ease-out;
}

.error-toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #f44336;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    top: -50px;
  }
  to {
    top: 20px;
  }
}